// 复用flex布局/
.flex(@hov:space-between,@col:center){
	display:flex;
	justify-content:@hov;
	align-items:@col;
}
.bgImg(@w:0,@h:0,@img:'',@size:contain){
	display: inline-block;
	width: @w;
	height: @h;
	background: url(@img) no-repeat center;
	background-size: @size;
}
.position(@pos:absolute,@top:0,@left:0,@w:100%,@h:100%){
	position: @pos;
	top:@top;
	left:@left;
	width:@w;
	height:@h;
}
.positionImg(@pos:absolute,@top:0,@right:0,@w:0,@h:0,@img:''){
	position: @pos;
	right:@right;
	top:@top;
	width: @w;
	height: @h;
	background: url(@img) no-repeat center;
	background-size: contain;
}